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Fatigue Analysis of Lower Limb Muscle Group Using Elliptical Machine with Constant Loading
( Li-cheng Hsieh ),( Ching-chia Hsieh ) 한국농업기계학회 2018 한국농업기계학회 학술발표논문집 Vol.23 No.1
The elliptical machine or trainer is one of the most popular sports equipment for cardiorespiratory fitness training. In recent years, it is widely used in the family and the gymnasium in Taiwan. Therefore, it is necessary for further discussion about the movements of the elliptical machine, and various levels of the lower-limb muscular fatigue using the elliptical machine in various strengths. The research collected the electromyography (EMG) signal of lower limb muscles, and used the commercially available software to analyze the possible timing that the fatigue appeared. The research applied this system to analyze the lower-limb muscular fatigue when using the elliptical machine with a constant resistance. It compiled the relevant literature, developed the experimental methods and analyzed the results. The subjects of this research arranged ten young people who used elliptical trainer for the first time. They carried the EMG and pedaled in a nature way. Then, Fourier transform was applied for all collected data, and the median frequency was calculated from 80% of the maximum value of the mild fatigue. The result showed that 60% of subject’s rectus muscle had been fatigued first. As a result, when using the elliptical trainer, it was much easier to use the muscles of the front thigh and get tired. Most of the fatigue occurred from overusing the lower limb muscle. By understanding the biomechanics of the elliptical trainer, it could avoid or reduce the fatigue and injuries during exercise. The system can analyze the fatigue timing as well. The fatigue analysis results would help the elliptical machine users avoid injuries, and increasing the efficiency of elliptical training.
Longevity, tumor, and physical vitality in rats consuming ginsenoside Rg1
Chao-Chieh Hsieh,Chiung-Yun Chang,Tania Xu Yar Lee,Jinfu Wu,Suchada Saovieng,Yu-Wen Hsieh,Maijian Zhu,Chih-Yang Huang,Chia-Hua Kuo The Korean Society of Ginseng 2023 Journal of Ginseng Research Vol.47 No.2
Background: Effects of the major ginsenoside Rg1 on mammalian longevity and physical vitality are rarely reported. Purpose: To examine longevity, tumor, and spontaneous locomotor activity in rats consuming Rg1. Methods: A total of 138 Wistar rats were randomized into 2 groups: control (N = 69) and Rg1 (N = 69). Rg1 (0.1 mg/kg per day) were orally supplemented from 6 months of age until natural death. Spontaneous mobility was measured by video-tracking together with body composition (dual energy x-ray absorptiometry) and inflammation markers at 5, 14, 21, and 28 months of age. Results: No significant differences in longevity (control: 706 days; Rg1: 651 days, p = 0.77) and tumor incidence (control: 19%; Rg1: 12%, p = 0.24) were observed between the two groups. Movement distance in the control group declined significantly by ~60% at 21 months of age, together with decreased TNF-α (p = 0.01) and increased IL-10 (p = 0.02). However, the movement distance in the Rg1 group was maintained ~50% above the control groups (p = 0.01) at 21 months of age with greater magnitudes of TNF-α decreases and IL-10 increases. Glucose, insulin, and body composition (bone, muscle and fat percentages) were similar for both groups during the entire observation period. Conclusion: The results of the study suggest a delay age-dependent decline in physical vitality during late life by lifelong Rg1 consumption. This improvement is associated with inflammatory modulation. Significant effects of Rg1 on longevity and tumorigenesis were not observed.
A Project for Dealing with the Missing Character Problem
Hsieh, C.C.,Wittern, Christian,Lehman, John 동국대학교 전자불전연구소 2001 전자불전 Vol.3 No.-
The project described in this paper takes advantage of the 7 year experience of the Academia Sinica Institute of Information Science Document Processing Laboratory in studying the missing character problem. It is intended to develop a packaging and processing system which is compatible with international standards for use in an internet or Windows environment. The initial design constraints were to use XML markup as part of a system to allow the viewing and processing of documents containing missing characters by any personal computer capable of running Windows 98, and using standard software such as Microsoft Word. It requires no modification of the user’s system or software, and provides facilities for sharing data between users. The project was funded by a grant from the Republic of China (Taiwan) Ministry of Education, and is expected to be further developed to run on a larger variety of systems.
Full-Duplex Underwater Acoustic Communications via Self-Interference Cancellation in Space
Hsieh, Yung-Ting,Qi, Zhuoran,Pompili, Dario 한국통신학회 2023 Journal of communications and networks Vol.25 No.2
Traditionally, underwater acoustic communicationsare half-duplex (HD), i.e., the hydrophones and transducersoperate in non-overlapping time-slots/frequency-bands in one di-rection. To double the spectral efficiency into the full-duplex (FD)mode, which transmit and receive signals simultaneously, a self-interference cancellation (SIC) technique in space is introducedand deployed. Specifically, a novel underwater acoustic system isproposed to perform FD-SIC efficiently via an integrated designcombining underwater acoustic vector sensor (AVS) and phasedarray transducer (PAT) to realize the spatial SIC. The energyfocusing function of the beamformer (BF) helps PAT avoid selfand mutual spatial interference. The AVS keeps updating thedirection of arrival information to let BF adjust the steeringangle via an adaptive protocol. The field-programmable gatearray (FPGA) Direction of Arrival Estimation (DOA) estimationis done by a 12-element AVS, run-time is 1.22×10−4 s byMUSIC method, which is promising for real-time applications. Inthis work, phase-shift keying (PSK) and PSK-based orthogonalfrequency-division multiplexing (OFDM) are deployed as theFD transmission modulation methods in the spacial SIC. Theproposal is evaluated and verified via both simulations andemulations in real underwater acoustic channels collected in theGulf of La Spezia, Italy, and it is able to achieve 59 dB SIC whilemodulating with binary phase-shift keying (BPSK) with carrierwave frequency 80 kHz and AVS steering angle −5◦. Moreover,it has at least 37 dB SIC within the steering angle region.
Transport of charged particles: Entropy production and Maximum Dissipation Principle
Hsieh, C.Y.,Hyon, Y.,Lee, H.,Lin, T.C.,Liu, C. Academic Press 2015 Journal of mathematical analysis and applications Vol.422 No.1
In order to describe the dynamics of crowded ions (charged particles), we use an energetic variational approach to derive a modified Poisson-Nernst-Planck (PNP) system which includes an extra dissipation due to the effective velocity differences between ion species. Such a system has more complicated nonlinearities than the original PNP system but with the same equilibrium states. Using Galerkin's method and Schauder's fixed-point theorem, we develop a local existence theorem of classical solutions for the modified PNP system. Different dynamics (but same equilibrium states) between the original and modified PNP systems can be represented by numerical simulations using finite element method techniques.
TESTS OF NONLINEAR CONSUMPTION FUNCTIONS : THE CASE OF KOREA , TAIWAN , THAILAND AND INDIA
HSIEH, WEN JEN,HSING, YU 한국국제경제학회 1994 International Economic Journal Vol.8 No.2
In this study, the permanent-income hypothesis and the Keynesian consumption function for four Asian countries are considered. The MPCs for Korea and Taiwan characterized by rapid economic growth have been on the decline, whereas the MPCs for Thailand and India with moderate or low economic growth have been stable. The decline in MPCs and rise in MPSs, in turn, are expected to facilitate government debt financing domestically and/or improve trade balance account. The real interest rate is found to be negative and significant only for India, suggesting that the government may use monetary policy to encourage saving. [E21, O11]
Determining optimal number of cores in a submarine power cable
Hsieh Meng-Chang,Chen Bang-Fuh,Wang Yanyang,Chang Hsun-Cheng,Liu Wen-Hsiu,Hsu Hung-Lin 대한조선학회 2022 International Journal of Naval Architecture and Oc Vol.14 No.1
Submarine power cables must be reinforced and must possess suitable mechanical properties to meet operational requirements for complex marine environments. This study numerically investigated the mechanical properties of submarine power cables under tensile, torsional, and compressive loading. The optimal number of cores was determined according to the variation in tensile and torsional stiffness with radial compressive pressure. As the radial compressive pressure increased, the tensile and torsional stiffness of the four- and five-core cable models decreased marginally compared with those of the threecore cable model; thus, the five-core cable model was superior to the two-, three-, and four-core cable models in terms of radial deformation and contact stress. The two-core cable model was superior to the three-, four-, and five-core cable models in terms of tensile and torsional strength. The results of this study can serve as a reference in the design of submarine power cables.